Transmission and clutch operating power means



y 22, 1951 H. w. PRICE 2,554,314

TRANSMISSION AND CLUTCH OPERATING POWER MEANS Original Filed May 11, 1942 8 Sheets-Sheet 1 K 9; fi 3% 391 I m mm U 116 INVENTOR. HAROAD IM H P/c5 Bl Wk AT TOR/V5 Y y 22, 1951 I H. w. PRICE 2,554,314

TRANSMISSION AND CLUTCH OPERATING POWER MEANS Original Filed May 11, 1942 8 Sheets-Sheet 2 INVENTOR. BY HAROLD W PRICE ATTORNEY May 22, 1951 H. w. PRICE 2,554,314

- TRANSMISSION AND CLUTCH OPERATING POWER MEANS Original Filed May 11, 1942 a Sheets-Sheet s INVENTOR BY HAROLQ W P555 ATTORNEY H. W. PRICE TRANSMISSION AND CLUTCH OPERATING POWER MEANS May 22, 1951 8 Sheets$heet 4 Original Filed May 11, 1942 l m m I 0 VIIII I IIIl/dllfl Tm ma p May 22,1951 w, PRl 2554,314

TRANSMISSION AND CLUTCH OPERATING POWER MEANS Original Filed May 11, 1942 8 Sheets-Sheet 5 I as;

19.10 INVENTOH HAROLD W. PRICE BY I ATTORNEY H. W. PRICE May 22, 1951 TRANSMISSION AND CLUTCH OPERATING POWER MEANS 8 Sheets-Sheet 6 Original Filed May 11, 1942 l llllffll INVENTOR HAROLD \M PRICE ATTORNEY y 22, 1951 H. w. PRICE 2,554,314

TRANSMISSION AND CLUTCH OPERATING POWER MEANS Original Filed May 11, 1942 s Sheets-Sheet 7 I76 I I I I50 7 I47 BY HARoL-b' W PRICE ATTORNEY May 22, 1951 H. w. PRICE TRANSMISSION AND CLUTCH OPERATING POWER MEANS 8 Sheets-Sheet 8 Original Filed May 11, 1942 "minimum INVENTOR. flmaw M Peace ATTOENE Y Patented May 22, 1951 UNITED STATES ATENT OFFICE TRANSMISSION AND CLUTCH OPERATING rowan MEANS Original application May 11, 1942, Serial No.- 442,465. Divided and this application March 2'7, 1944, Serial No. 528,235

13 Claims. 3

This invention relates to motor vehicles and more particularly to improvements in the transmission of power from the engine to the driving wheels of a motor vehicle.

It is customary, in connection with the drive for motor vehicles, to provide a speed ratio changing transmission for varying the driving ratio between the engine and the vehicle driving ground wheels, and my invention is in part directed to power means automatically operable, when the accelerator or other manually operated engine control means is depressed slightly beyond the fully opened throttle position, to cut out of operation the engine controlling ignition system as the transmission is being power operated to uncouple the engine of the vehicle and the driving wheels thereof and then to so operate the transmission as to lower the speed ratio between the engine and the driving ground wheels and to again render the ignition operative to effect a speeding up of the engine just prior to the completion of said operation of the transmission.

It follows, therefore, that my invention is directed to means for automatically effecting a change in the transmission speed ratio at a time when the internal combustion engine is incapable, at the then existing setting of the transmission and despite a fully opened position of its throttle, of either maintaining or increasing the speed of the vehicle. Such a lowering of the speed ratio will also probably prevent a choking of the engine should the vehicle be climbing a steep hill.

The principal object of my invention is to provide, in an automotive vehicle having a power plant comprising an internal combustion engine, an ignition system, a friction clutch and a change-speed transmission, power means for disengaging said clutch and establishing said transmission in one or the other of two settings said means serving to automatically disengage the friction clutch and establish the transmission in one of its settings when the speed of the vehicle is reduced to a certain factor, to automatically establish the transmission in the latter setting when the car is traveling below a certain speed and the accelerator is fully or substantially fully depressed said operation being facilitated by a momentary disabling of the ignition system, and to automatically establish the transmission in the other of the two aforementioned settings when the accelerator is fully or substantially fully released and the car is traveling at or above a certain speed. It is a further object of my invention to combine, with the aforementioned mechanism, a fluid coupling said coupling serving to facilitate the last men tioned operation of the mechanism.

In carrying out the above objects of my invention I have, in a preferred embodiment of my invention, provided a friction clutch operating pressure differential operated motor, a valve for controlling the operation of said motor, a simple and compact pressure differential and spring operated transmission operating motor unit including a control valve, a power element, an ignition interrupter switch and an electromagnet or so called holding coil, means for actuating the latter valve, a relay mechanism for controlling the operation of the ignition interrupter switch, the holding coil and valve actuating means and means for controlling the operation of the relay mechanism and the first mentioned valve including a vehicle speed responsive governor and a switch operated thereby, an accelerator operated switch mechanism, another switch and means for operating the same the operation of which is dependent upon the speed of the engine.

Yet another object of my invention is to provide, in the power plant of an automotive vehicle, power means for effecting either a so-called kickdown or an upshift operation of a change-speed transmission, the kickdown operation being facilitated, if this operation is efiected when the vehicle is traveling at or above a certain speed, by an operation of the power means to momentarily disable the ignition system of the engine of the vehicle and thereby reverse the torque of said engine, said kickdown or downshift operation of the transmission being facilitated, if this operation is effected when the vehicle is traveling below a certain relatively low speed, by a power disengagement of a friction clutch to thereby uncouple the engine from the transmission. An important feature of this part of my invention lies in the construction and arrangement of the parts of the clutch and transmission operating and ignition controlling power means, said parts including a single means, preferably a vehicle speed responsive governor, which serves to control that part of the power means which operates the friction clutch and that part of the power means which operates the transmission; said parts further including a switch mechanism, also operated by a single means, preferably the accelerator, operative to control both of the aforementioned parts of the power means.

Yet another object of my invention is it? P20 'vide a power plant for an automotive vehicle including a manually and power operated friction clutch, a fluid coupling and a manually and power operated change-speed transmission, said power plant being operative to effect, by depressing the accelerator and without manually operating the clutch, a smooth start of the vehicle from rest after the transmission has been manually operated to establish the same in a relatively low gear setting and to thereafter effect, after the transmission has been manually operated to establish a certain setting thereof, an operation of the transmission by power means without operating the clutch.

Yet another object of my invention is to provide a spring and fluid pressure operated power means for operating the change speed transmission of an automotive vehicle to alternately establish the transmission first in one and then the other of two settings, said power means including means for reversing the engine torque to facilitate the operation of the transmission and further including a minimum of controls.

Other objects of the invention and desirable details of construction of parts will become apparent from the following detailed description of certain embodiments of the invention, taken in conjunction with the accompanying drawings iilustrating said embodiments, in which:

Figure l is a diagrammatic view of a preferred embodiment of the clutch and transmission operating and ignition controlling power means constituting my invention;

Figure 2 is a side View of the motor unit disclosed in the embodiment of my invention shown in Figure 1, said unit constituting the principal element of my invention;

Figure 8 is an end view of the motor unit disclosed in Figure 2;

Figure 4 is a sectional view of the motor unit of Figures 2 and 3 disclosing the parts of the mechanism in their upshift position;

Figure 5 is a view similar to Figure 4 disclosing the parts of the motor unit in their downshift position;

Figure 6 is a longitudinal sectional view showing details of the governor and governor operated switch mechanism constituting a part of the embodiment of my invention disclosed in Figure 1;

Figure 7 is a view looking in the direction of the arrows 'l'i of Figure 6, disclosing the switch mechanism of the governor and switch unit disclosed in said figure;

Figure 8 is a sectional view taken on the line 88 of Figure 7 disclosing certain details of the switch mechanism of Figure 6;

Figure 9 is a view of the clutch control motor and valve unit of that embodiment of my invention disclosed in Figure 1, the valve mechanism being shown in end elevation and the motor being shown in longitudinal section;

Figure 10 is an end elevational view of the motor and valve unit of Figure 9;

Figure 11 is a sectional view, taken on the line 4 L-I4 of Figure 15, of the accelerator operated switch and second stage bleed valve mechanism of the clutch control mechanism disclosed in Figure 1;

Figure 15 is a sectional view of the valve and switch mechanism of Figure 14 taken on the line iii-l5 thereof; and

Figure 16 is a sectional view disclosing details of a fluid coupling, a friction clutch and a portion of a change speed transmission the latter mechanism being actuated in part by the motor means of my invention.

The transmission, friction clutch and ignition controlling mechanism constituting my invention and disclosed in my parent co-pending application No. 442,465 filed May 11, 1942, may be employed in conjunction with various types of motor vehicle power plants including a friction clutch, a change-speed transmission and an ignition system for in part controlling the operation of the internal combustion engine of the plant; however, in order to illustrate the use of one embodiment of my invention in this divisional application, I have shown the same incorporated in the power plant diagrammatically disclosed in Figure 1. This power plant includes a carburetor l2 and a throttle valve I l which is operated by an accelerator It. The accelerator, which is biased to its throttle closed position by a spring I7, is preferably connected to the throttle by means of a rod 13, one end of which extends through an opening in an enlarged end portion 20 of a throttle operating crank 22. This crank is returned to its throttle closed position by a spring 23. A spring 24, stronger than the spring 23 and sleeved over the rod i8, is interposed between the end portion 28 and a stop 28 secured to the rod l8. By means of this construction the throttle is opened when the accelerator is depressed and when the throttle reaches its full open position against a stop 28 any additional movement of the accelerator results in a coinpression of the spring 24 and a closing of a threepole electrical switch 3!. The function of the switch 31 will be described hereinafter. It is also to be noted that by virtue of a pin and slot lost motion connection 33 an accelerator operated clutch control breaker switch 34 is opened during the first increment of throttle opening movement of the accelerator and before the throttle begins to open. The relative timing of operation of the switches 3| and 34 and the throttle M will be more completely described hereinafter.

As disclosed in Figure 16 the crank shaft i l of the engine may be connected to the impeller of a fluid coupling I3 of conventional design, the vane runner l5 of which is connected to the driving member 36 of a friction clutch 38 of conventional design. The fluid coupling and friction clutch are preferably housed within a casing 39. The driven member 42, that is the driven plate of the friction clutch, is connected to a transmission driving shaft carrying the usual main driving pinion 43. The transmission mechanism, indicated by the reference numeral 45, is of the change-speed type, that is a mechanism including gears or their equivalent for effecting a plurality of different speed ratios in the driving relation between the internal combustion engine or other prime mover and the propeller shaft of the vehicle. Such a speed ratio varying transmission includes positively engageable drive control elements at least one of which is movable into engaging relation with another of said elements to effect a drive from the engine to the vehicle propeller shaft driving member of the transmission and into disengaging relation with respect to said element to release said drive. These two elements when engaged are subject to thrust application therebetween during the driving operation; accordingly, they resist relative disengagement until such time as the thrust application is relieved. When the engine acting as a prime mover is driving the vehicle and a change-speed operation of the transmission is desired then before the aforementioned movable element may be moved out of engagement with the element meshed therewith the driving torque or driving load of the engine must be substantially reduced.

My invention in one of its aspects is directed to power means for effecting a movement of the aforementioned movable drive control element to one or the other of two operative positions, here inafter called the upshift position or the kickdown position, to thereby establish one or the other of two different gear ratios or more broadly stated, speed ratio settings of the speed ratio transmission. The transmission mechanism may of course include other means including a manually operable shift lever positioned under the steering wheel, for manually operatin the transmission to establish certain drive ratio settings thereof. In the operation of the transmission, in conjunction with the operation of the mechanism disclosed in Figure 1, either a relatively low or a relatively high gear ratio setting of the transmission is effected by an operation of said manually operated shift lever. The power means of my invention is also operative to suspend for a limited time the operation of the engine driven driving member of th aforementioned relatively movable members and this operation facilitates an operation of the power means to efiect the aforementioned kickdown operation of the transmission.

In the preferred embodiment of my invention disclosed in Figure 1 this brief suspension of the driving operation is automatically effected, when the accelerator is released to close the switch 34 and the speed of the vehicle is lowered to or below a predetermined factor, by disengagement of the friction clutch by means of a pressure differential operated motor. As will be brought out hereinafter the mechanism of Figure 1 is also operative to momentarily disable the ignition system when a kickdown operation of the tran mission is effected by fully depressing the accelerator to close the switch 3 I.

Referring again to Figure 1 there is disclosed a pressure differential and spring operated motor unit 46 the power element 96 of which is operably connected by a rod 92 to a crank, not shown, extending from the casing of the changespeed. transmission d5. This crank is of course connected to the above discussed movable drive control element of the transmission mechanism. When the crank is moved by a pressur diiferential operation of the motor unit 46 to one of its two positions then at that time the transmission is established in its upshift position and when said motor unit is energized by the expansion of a spring 208, Figures 1 and 5, there is effected the kickdown operation of said unit and the crank is moved by this operation to the other of its two operative positions.

Continuing the description of the mechanism disclosed in Figure 1 the transmission and friction clutch operating and ignition controlling power means, and the most essential parts of the engine controlling ignition system include the aforementioned pressure difierential and spring operated motor unit disclosed in detail in Figures 4 and 5, a relay mechanism for controlling the operation of the hereinafter described electrical units in the motor unit, an ignition coil 52, a distributor 54 electrically connected to grounded spark plugs, one of which is indicated by the reference numeral 56, a grounded breaker switch 58, a grounded condenser 69 and means for controlling the operation of the electromag" nets of the relay, said means including a grounded breaker switch 6d operated by a vehicle speed responsive governor 66, the aforementioned breaker switch 3| operated by the accelerator I6 and a hereinafter described grounded limit switch 61.

Referring now to Figures 4 and 5 disclosing the details of the transmission operating and ignition controlling motor unit 46 of Figure 1 this unit includes a cup-shaped casing member 88, the base of said member, that is, one of the end walls of the motor unit, being provided with an opening to receive a bearing member 96, which slidably receives a rod 532 pivotally connected at one of ends to the transmission operating crank, not shown, and at its other end fixedly secured to the central portion of a piston 94. Any other suitable power element such as a flexible diaphragm fixedly secured to the casing member 88 may be substituted for this piston. The usual flexible boot 9B of any suitable material, such as rubberized fabric or rubber substitute, interconnects the bearing 9e and the rod. To the peripheral portion of the cup-shaped casing member 88 there is detachably secured a plate 9"! constituting the other end wall of the motor unit and to the inner face of said wall there is secured an electromagnet 98 constituting a holding coil for the piston, the operation of said coil being referred to hereinafter. This holding coil includes an iron core IEO, bored to slidably receive switch operating means, and a winding I02 the latter being housed between the outer surface of the core and the inner surface of a cup-shaped housing member Ifl. The winding 92 is grounded to the casing of the motor unit by a conductor 1G6 and is connected by a conductor I83 to a conductor no mounted in the casing member 91 of the motor unit. When the holding coil 98 is energized, which is concurrent with the energization of a valve operating solenoid H6, Figure 13, a plate IH fixedly secured to the piston '94 is attracted toward said holding coil. The conductor II?) is of course insulated from the casing member 9'1. and to said conductor there is connected a conductor II2 connected at its other end to the winding H4 of the valve operating solenoid H6. To a plate H8, constituting a part of the means for maintaining the holding coil in place, there is secured, by a screw I29, a cup-shaped plate I22 to which is detachably fastened an ignition interrupter switch I24. This switch includes a yieldable angular shaped metal clip I26 constituting the movable contact member of the switch and is secured to the plate I22 b means of ametal stud G28 constituting the fixed contact of the switch. The stud is insulated from the movable contact member and the plate :22 by suitable means such as washers I33, 532 and I34. To the stud or fixed contact of the switch I25 there is connected a wire its leading to a movable contact of the hereinafter described relay mechanism 50 and the movable contact E26 of the switch I24 is grounded by means of its contact with the plate I22 which is mounted on the member H8 secured to the casing member Bl. The motor unit is conveniently detachably secured by a bracket I38 to the chassis of the vehicle which acts as a ground connection. As disclosed in Figure 5 the movable contact I26 f the ignition interrupter switch IZll is shaped to normally be out of contact with the fixed contact I28 of the switch and is forced into contact with the latter contact by means of a yieldable force transmitting means interposed between the motor piston 94 and said contact. This connecting means include a oylindri cally shaped metallic plunger I40 slidably mounted in the bored core I08 of the electromagnet holding coil as and to one end of the plunger there is secured a headed stem I42 slidable through an opening in the base of a cupshaped plunger member M4. A spring i 16 surrounding the stem M2 is interposed between one end face of the plunger member Hill and the base of the plunger member I44.

The three-way valve for controlling the operation of the motor unit 45 and the means for operating said valve are disclosed in Figure 13. Describing these elements there is provided a two-part solenoid and valve casing secured to the casing of the motor unit by a bracket I41. The upper part I48 of the two-part casing is cup-shaped and houses the solenoid winding Ht which is connected by a conductor i561 to a conductor I52 secured to said part of the casing and insulated therefrom. To the conductor I52 there is connected the aforementioned conductor H2 which is connected to the winding I62 of the holding coil 88. The later member is electrically connected toev relay switch 3H1 which is in turn electrically connected to a grounded batter 400.

The lower part 56 of the two-part solenoid and valve casing is cup-shaped and is detachably secured to the upper part I48 of the casing by fastening means I68; and a valve plate llEl, housed within the casing, is secured by the fastening means I63 to the casing parts. This plate H0 is cupped in its central portion and in the base of the cupped portion there is provided an opening outlined by a downwardly extending flange Hi. This flange constitutes a seat for a valve member II i secued to a stem I'lii passing through the aforementioned opening in the valve plate and extending from the armature I'i8 of the solenoid HE. A spring Ifill, interposed between one end of the armature and a fitting I82 secured to the casing part hi3, serves a means for biasing the valve member I'I l to the valve closed position disclosed in Figure 13. In this position of the valve member the same is seated on the upper end of a hollow fitting ltd secured to the lower casing member ic. A hollow fitting ISE secured to the casing member ia8, provides a means for venting the interior of said member to the atmosphere and a hollow fitting I88 secured to the casing member its receives one end of a flexible conduit Itt" connected at its other end to a hollow fitting I5 2 secured to the end plate ill of the motor unit Lit, all as disclosed in Figures 2 and 3. To the outer end of the fitting I8 l there is secured a vacuum conduit Hi4, said conduit being connected at its other end to the intake manifold of the internal combusdon engine of the vehicle.

Describing now the operation of the motor unit QB, its control valve ill; and the means for operating said valve when the solenoid H5 is energized, its armature Ill? is moved upwardly thereby seaing the valve upon the flange I'iZ of the valve plate Ill). The valve is thus opened and there results an energization of the motor unit by a differential of pressures acting upon the power element 9:3, for the opening of the valve effects a partial evacuation of a motor chamber I98 outlined by the piston or power element 94, the casing member 91 and a portion of the casing member 83. Air is drawn from said chamber I98 via the conduit Hit, a chamber 269 outlined by the casing member 65 and valve plate I10, and the conduit IEPG connected to the intake manifold. The right side of the piston 93 is, by virtue of the partial vacuum existing in the chamber I92, subject to a relativel low gaseous pressure and the left side of said piston is sub= ject to the relatively high gaseous pressure ex erted by the aunosphere, for a chamber 202, outlined by the piston 94 and a portion of the casing member 88, is permanently vented to the atmosphere via a hollow fitting 204 to which may be connected an air cleaner, not shown. An air cleaner may also be connected to the aforementioned fitting I38, Figure 13. Accordingly, the energization of the solenoid IIil results in an upshift operation of the motor unit Mi, that is the parts of said unit take the positions disclosed in Figure 4, the rod 92 moving to the right thereby moving the crank 48 to its upshift position. Referring to Figure 4 it will be noted that by this upshift operation of the motor unit the ignition interrupter switch IN is closed; for when the piston 9A is forced to the right, by the difierential of pressures to which it is subjected, the yieldable force transmitting means, including the member lit, the spring I46 and the plunger I40, is operative to angularly move a part 208 of the movable contact I28 of the switch I24 to the right from the position disclosed in Figure 5 to that disclosed in Figure 4.

An important feature of my invention lies in the relative strength of the materials going to make up the spring I 36 and the bendable contact member I26; for a greater force is required to collapse the spring Hi6 than is required to move the switch part 285 to its switch closed position disclosed in Figure 4. It follows therefore that when the aforementioned force transmitting means Hill, ltd and ifi is subjected to the load of the rod 92 the switch part 206 will be angularly moved to close the switch I24 before the spring Ifi is collapsed. In this operation the member Hid telescopes over the stem E42 from the position disclosed in Figure 5 to he position disclosed in Figure 4.

Completing the description of the operation of the motor unit when its parts assume the positions disclosed in Figure 4, it is to be remembered that the holding coil 98 is energized simultaneously with an energization of the solenoid IIS; accordingly, when the piston 96 reaches the position disclosed in said figure it is held in said position not only because of the differential of pressures acting on said piston but also by virtue of the operation of the energized holding coil, for the plate Ill is then held firmly against the end of the core I00.

Describing now the kickdown operation of the motor unit 46 when the valve operating solenoid i 36 and the holding coil 98 are deenergized there results an energization of the motor unit by virtue of the operation of a spring 298. This spring, which is interposed between the piston 94 and the casing member 91, is compressed or cocked, to become a source of potential energy, when the piston 94 is moved to its upshift position disclosed in Figure 4. When the solenoid I I6 is deenergized the spring [8%, Figure 13, expands thereby moving the valve member i 94 to the position disclosed in said figure. The chamber I98 of the motor unit is by this operation vented to the atmosphere via the hollow fitting I36, a chamber 2 Ill outlined by a portion of the casing member M8 and the valve plate iii), the opening in said plate, chamber 2510, and conduit I90.

The piston 94 is then no longer subject to the force resulting from a differential of gaseous pressures acting upon the same and is free to be moved to the left, to the position disclosed in Figure 5, by the expansion of the spring 208; and this operation of course eifects a rotation of the transmission operating crank, not shown, to establish the transmission in its kickdown setting.

Now it is an important feature of my invention that during the first part of this kickdown movement of the piston 94, that is when the slack in the system is being taken up, the aforementioned drive control elements of the transmission are being moved out of engagement with each other and the synchronizing mechanism of the trans- Y mission is operating, the switch I24 is not opened; for it is to be noted, as is evident from the descripticn of the mechanism given above, that before said switch may open the spring I46 must expand, while the rod 92 is in contact with the 1 member Md, until the parts of the force transmitting means are in the position disclosed in Figure 5. Accordingly, the relative strengths of the spring M2 and the contact member I26 and the construction and arrangement of the coop- I crating parts are preferably such that when the kickdown operation of the motor unit is taking place, the piston 94 moves a short distance and the spring 145 at the same time expands, before the switch I24 is opened. The purpose of this particular timing of the opening of the switch I24 will be brought out hereinafter when the complete operation of my invention is described.

Describing now the governor 66 and breaker switch 64 operated thereby, disclosed in detail in Figures 6, 7 and 8, this mechanism, hereinafter referred to as a governor and switch unit, includes a cup-shaped casing member 2!! having an opening 2E3 in its base. A drive shaft housing member 2M is secured at its upper end to said casing member, a portion of said member extending through the opening 2l3. The member 2 M may be threaded at 2 It to provide means for securing the governor and switch unit to the chassis or any other convenient support. member 2M is bored to receive a governor drive shaft 258 having a gear member 22!] secured to its lower end by a pin 222. The drive shaft 218 is journalled in bearings 224 and 226 which are grooved at 228 to receive a lubricant. To the upper end of the drive shaft there is secured a pin 23!! telescoped within a cup-shaped member 232. The lower end of the member 232 is provided with an outwardly extending flange 234 having portions thereof fitting within notches 236 and 233 in centrifugally operated weights 2% and 2 52 respectively, said Weights being moun ed on pins 24% and 256. These pins are secured at their ends to a stamping 248 U-shaped in cross section secured to the end of the driving t 288, A relativel thin plate 250 is fixedly mounted on the top of the housing member 2M and felt 252 or any other suitable air filter material is packed between the plate 250 and the bottom of the casing member 2l2. This filter is The mentioned cup shaped member 232.

incorporated in the governor and switch unit for the purpose of cleaning the air which is drawn in via an opening 254 in the base of the casing member 2 [2 into said casing. The filter absorbs any water which is admitted to the interior of the casing via the opening 252; for the operation of the centrifugal weights results in a partial vacuum being created within the unit and as a result air, water and dirt are drawn through the opening 252.

Describing now the breaker switch mechanism disclosed in Figures 6, 7, and 8, the same is mounted on the inner side of a cover plate 25$ of the governor and switch unit which plate is detachab-ly secured, by fastening means 258, to the cup-shaped casing member H2. The switch mechanism comprises a thin, flat U-shaped metal stamping 256, Figure 7, constituting the movable contact member of the switch and a metal bolt 262 constituting the fixed contact member of the switch. The movable contact which operates as a lever is provided with a metal tab 253 extending inwardly from one end portion of the stamping, said end portion being enlarged at 26d as clearly disclosed in Figure 7. The fixed contact 282 is insulated from its support by any suitable means 266 and is so provided with a metal tab 268 contactible by the tab 263. The U-shaped movable contact is provided with openings 268 and 22'!) and through these openings extend fulcrum members 272 and 214. The latter members are preferably rectangular in shape and slightly bent at their ends, thereby providing a fulcrumfor the contact member 269 when said member is forced against the members 2l2 and 214 as it is being rocked to open and close the switch. The members 232 and 27d constitute an integral part of a stamping 276 which may be riveted to the inner surface of the casin member 25%.

Describing the means for effecting the rocking action of the movable contact member, that is, the operation of said member when it functions as a lever, there is provided a coiled tension spring 222 having a hook 282 at one of its ends extending through an opening in a central part 28! of the U-portion of said contact member. The other end of the spring 2 18 is provided with a hook 282 which extends through an opening in one end of a rectangular shaped metal stamping 236. This stamping is preferably provided with a rectangular shaped opening 288 in its other end through which opening there extends 9. rectangular shaped support member 290. As with the aforementioned fulcrum members 272 and 2'! the member 292 is an integral part of the stamping 285 and is slightly bent at its upper end to provide a groove to support the end of the stamping. The central portion of the stamping 28% is provided with an opening through which extends the shank portion of a yieidable member 292 made of any suitable non-conductive material such as synthetic rubber. One end of this member 232 is preferably rounded as disclosed in Figures 6 and 8 and is contacted by the afore- A coiled compression spring 294 is sleeved, at one of its ends, over the shank of the member 292 and at its other end is fitted within a screw 296 bored to receive said spring. This screw is threaded into a cylindrically shaped member 2% fixedly secured to the casing member 255 by means of a cylindrical portion 305] extending through an opening in the casing member 25% and bent over at its end to provide means not only to clamp the member 298 in place but also to secure the stamp- Describing now the operation of the governor and the breaker switch operated thereby, it will be noted as disclosed in Figure 8, that when the tension spring 218 extends in a line forming an acute angle A with the plane of the U-shaped movable contact member 269, then said spring exerts a force having a component which lifts the end portion of said contact member upwardly, that is, away from the plane of the casing member 255. This condition results in the holding of the contact tabs 263 and 268 in engagement with each other to maintain the switch closed, and the switch remains closed when the car is at a standstill or is traveling below the higher of two critical governor speeds, say thirteen miles per-hour, as the speed of the vehicle is being increased. Until this critical speed is reached the governor mechanism does not force the cup shaped member 232 upwardly far enough to move the member 282 and the stamping 286 connected thereto. To effect a closing of the switch the compression spring 294 forces the movable end of the stamping 28E downwardly to the position disclosed in Figure 8 in which position the contact member 260 and spring 2-13 are out of alinement with each other as disclosed by the angle A in said figure.

When the vehicle speed is being increased and is approaching the aforementioned critical upshift speed of 13 M. P. 1-1., the governor weights 24D and 242 rotate about the pins 243 and 256 in the direction of the arrows shown in Figure 5 thereby forcing the member 232 upwardly to com- 5 press the spring 294 and move the spring 2T8 into alinement with the movable contact member 2651. When the aforementioned critical vehicle speed is attained spring 218 is positioned very slightly beyond dead center with respect to the contact member 255:; then the longitudinal axis of said spring lies i a plane forming a very small acute angle with the plane of said contact member. The spring then exerts a force having a component tending to pull the portion 26! of 1 the contact member toward the plane of the casing member 256. The contact member acting as a lever is by this operation rocked with a snap action about its fulcrum to open the switch. Upon decreasing the vehicle speed to the critical downshift speed of, say 10 M. P. H., the force exerted by the centrifugal weight driven member however, this is a desirable feature of the switch 'mechanism of my invention, inasmuch as such a mechanism is free of the undesirable hunting operation of a breaker switch. By adjusting the setting of the screw 2% with the consequent variation of the loading of the compression spring .294 the critical governor speeds may be varied as desired. To make this adjustment it is necessary to remove a protective packing 29? of wax or other suitable material.

Continuing the description of the operation of the friction clutch and transmission operating and ignition controlling mechanism diagrammatically disclosed in Figure 1 with the car at a standstill and the engine idling the clutch is disengaged by the power means described hereinafter. A manually operated shift lever, not shown, conveniently positioned near the steering wheel of the vehicle, is then actuated to establish the transmission in a low gear setting. The accelerator I 5 is then depressed as the clutch is engaged and the car is gotten under way. In this operation if the power plant includes a fluid coupling then said coupling cooperates with the friction clutch 33 to effect a smooth start of the vehicle.

Now, it is to be remembered as previously described that when the car is at a standstill 01' is traveling below a certain speed the governor operated breaker switch 64 is closed as is disclosed in Figures 1 and 6; and when said switch is closed an electrical circuit is completed through the relay 58. This circuit includes the grounded switch 54, and an electromagnet 358 electrically connected to the grounded battery 93. The electromagnet 398 is thus energized thereby opening the relay switch Bill to break the electrical circuit from the battery to the valve operating solenoid H6 and the holding coil 98. The solenoid and holding coil are accordingly deenergized resulting in a positioning of the power element of the motor unit in the downshift position disclosed in Figure 5, all as previously described.

It follows therefore that the transmission remains established in its downshift setting until the speed of the vehicle is increased to the governor speed which may be 13 M. P. As stated above, this critical governor speed may be changed at will by adjusting the screw 53%, Figure 6. When this critical speed is reached the governor operating switch (5 1 is opened, thereby breaking the electrical connection between said switch and the relay 'electromagnet 3%; the latter is then deenergi ed resulting in the closing the switch SW. The holding coil as is then energized to later perform its function and the solenoid H8 is energized to open the three-way valve mechanism, Figure 13, controlling the motor unit. The chamber I98 of the motor unit is thus connected with the intalre manifold and when the gaseous pressure, or in other words, degree of vacuum of said manifold, reaches a certain factor then the motor unit will be energized, as previously described, to establish the transmission in its upshift setting. This gaseous pressure is effected by releasing the accelerator and this is done by the driver when the. desired speed of the vehicle in the kickdown setting of the transmission has been attained. It is not necessary, however, to completely release the accelerator to effect this result. Now when the power element at of the then energized motor unit reaches its upshift position disclosed in Figure 4 the energized holding coil $8 maintains said power element in this position until the hereinafter described kickdown operation of the motor unit is effected; for when the air gap between the plate III and the end of the holding coil is relatively small, that is, after the demeshing operation of the transmission has been completed, the holding coil exerts an appreciable magnetic pull to draw the plate Hi into contact with said end of the coil. The function of the holding coil now becomes apparent, for when the driver, desiring to either speed up the vehicle or to maintain its speed, again depresses the accelerator short of a position to close the switch 35 the gaseous pressure in the manifold and cham' ber I98 connected thereto is increased. The then energized holding coil, however, serves to maintain power element 94 in its upshift position. It

13 is assumed of course that. the car speed is at the time maintained sufiiciently high to prevent the closing of the switch 64.

The motor unit 46 is thus automatically operative to establish the transmission in its upshift setting when the accelerator is released far enough to make possible an operation of said unit by vacuum and the car speed is at the time at or above the higher of the two governor speeds; and the transmission, by virtue of the operation of the holding coil, remains in this upshift setting despite a subsequent depression of the accelerator to maintain or increase the speed of the vehicle.

Completing the description of the mechanism disclosed in Figure 1 th re is provided b this mechanism power means for establishing the transmission in either its upshift or kickdown settings and for operating the friction clutch and controlling the ignition system to facilitate the operation of the transmission to effect its kickdown setting. The clutch operating power means, described hereinafter, serves to facilitate the kickdown operation of the transmission when the vehicle is being brought to a stop; and a momentary disabling ofv the ignition system serves to facilitate this kickdown operation when the accelerator is depressed to close the switch 31.

As disclosed in Figure l the above described transmission operating and ignition controlling motor unit 46 is controlled by the aforementioned relay mechanism 50 which includes two separate relays 304'and 306. The relay 3!, comprising an electromagnet 308 and a breaker switch 3H3, servesto control the operation of the valve operating solenoid Hi3 and the holding coil 98 of the motor unit; and the relay 366, comprising an electro-magnet 312 and a breaker switch 3M, cooperates with the ignition interrupter switch il to provide means for momentarily disabling the ignition system when and only when the kickdown operation of the transmission is initiated by depressing the accelerator to its full open position. The electromagnet 363 of the relay 394 is controlled by either the above described governor operated switch t4, Figure 6, or by the accelerator operated three-pole switch mechanism 3i and the aforementioned grounded limit switch 61. The latter switch, or its equivalent operative as a function of the speed of the engine, includes a flat plate 351 of relatively large area pivotally mounted at 3I8 or some convenient part of the engine where it will receive the current of air from the engine cooling fan but will not be materially affected by the air passing through the radiator grill. The force exerted by this current of air will therefore be substantially directly proportional to the speed of rotation of the fan and therefore substantially directly proportional to the R. P. M. of the engine. To one side of the plate 3|? there is secured the movable contact 320 of the wind switch and said contact, when the switch is closed, abuts a fixed contact 322 of the switch secured to some part of the engine or any other convenient support 324. Describing the operation of this switch, at a relatively high speed of the engine, say 2500 R. P. M. the plate 35? is subjected to a force exerted by the current of air generated by the cooling fan and this force is of sufficient magnitude to move the plate clockwise against the ten sion of a spring 326 to close the switch. It follows of course that when the speed of the engine drops below 2500 R. P. M. the spring 326 functions to open the switch 3 I I.

Describing now that part of the ,power means of Figure 1 operative to control the engagement and disengagement of the friction clutch 38, there is provided a single acting pressure differential operated motor unit 328, Figures 1 and 9 to 12 inclusive, the power element 330 of which is operatively connected by a rod 332 to a lever 334 connected by a rod 336 to the driven plate 42 of the friction clutch 38. The clutch operating motor 328 is controlled by valvular mechanism, disclosed in detail in Figures 13 and 14, including a three-way valve mechanism 338, operative to initiate the clutch disengaging and clutch engaging operations of the motor, a first stage bleed 'valve 340, automatically operative, when the clutch plates contact at a predetermined load, to terminate a relatively fast clutch engaging movement of the motor power element 330 and a second stage bleed valve 342, Figures 14 and 15, operated by the accelerator and operative to control the loading of the clutch plates as said plates are moved, by a clutch spring 3%, into firm engagement with each other.

' Describing now in detail the clutch control motor unit 328 disclosed in Figures 9 to 12 inclusive, the motor part thereof, disclosed in section in Figure 11, includes cup shaped casing members 33! and 333 each provided with a flange and between said flanges there is detachably secured by fastening means 335, a flexible portion of the power element 330 of said motor. The motor unit is preferably detachably secured, by studs 331, to some part of the chassis of the vehicle or other convenient support located near the clutch operating crank 334.

The aforementioned three-way valve and first stage valve, together with the means for operating said valves, is detachably secured as a unit to the casing member 333 by a stud 339 extending into a body member 36! of said unit. This unit includes a cup shaped casing member 343 detachably secured, by studs 345, to the body member 3M and also includes cup shaped casing members 3'5? and 3453 together constituting a housing for the first stage valve 349 and the power means for operating said valve. The casing members 341 and 349 are each provided with a flange and between said flanges there is secured, by studs 35!, a flexible diaphragm 353 constituting the power element of the power means for operating the valve Mil. To the central part of the diaphragm 353 there is secured a hub member 355 which is recessed to receive a valve member 351 constituting the most important element of the first stage valve mechanism 345). The diaphragm 353 is biased, to the valve closed position disclosed in Figure 11, by a spring 359, one end of said spring being sleeved over a pin 36! extending through the center of the diaphragm 353 into hub member 355 and secured thereto. The other end of the spring 359 extends within the interior of a cup shaped member 363 fixedly secured to the central part of the casing member 341. A stud having an enlarged end portion 36'! abutting the spring 359, is threadedly mounted in the base portion of the member 363.

Describing now the valve mechanism 338 and the means for operating the same the casing member 3 53 constitutes a housing for a valve operating solenoid 3-59 comprising a winding 31! and an armature 313 to the lower end of which is secured a valve member 375. A disk shaped member 3i! is detachably secured, by the studs 345, to the body member 3 4! and the casing membreaker switch 84.

operation of the motor unit 328.

.much as possible.

- engine.

. clutch pedal.

.ber .343 and said member 311 is cupped inits accelerator operated breaker switch 34, Figures 14 and 15, and the grounded governor operated When these three switches are closed, that is, when the accelerator is released, the vehicle is at a standstill or is travelling at or below governor speed, and the clutch pedal is released, the valve operating solenoid 389 is energized to initiate a clutch disengaging As the clutch pedal is .being moved to its clutch disengaged position the switch 319 .is preferably opened at the cushion point of the clutch plates, that is the position of the movable driven clutch plate when it is in slight contact with the driving .clutch plate; and this operation renders the clutch control mechanism inoperative until such time as theclutch pedal is returned to its clutch engaged position.

. Explaining the function of the switch 319, when the engine is dead and the car is at a standstill it is best to manually disengage the friction clutch .38 prior to cranking the engine; forregardless of whether or not the transmission 44 .is in neutral and regardless of the operation of the fluid clutch if the vehicle includes this mechanism it is always best, to avoid a possible stalling of the engine, to unload the engine as If, perchance the transmission isin gear, then it is quite necessary to manually disengage the friction clutch before cranking the This desirable unloading of the engine is of course accomplished by disengaging the friction clutch and this must be done by depressing the clutch pedal This operation is necessary for the reason that at this time, that is, before the engine is started there is no source of vvacuum to energize the clutch operating motor uum in the intake manifold by a starting of the engine, then the clutch motor unit will be energized before the clutch disengaging movement of the clutch pedal is completed; and this results in a sudden reduction of the force necessary to .complete the disengagement or" the clutch or,

expressed in other words, a lightening of the This is of course an undesirable effect and will probably result in the clutch pedal being slammed against the floorboard. The incorporation of the switch 319 in the means for controlling the clutch control valve 338 prevents '34, the valve 342 and the means for operating To the under side of av the switch and valve. cover member 383, which is made of a non-conductive material, there is secured a U-shaped metallic member 385 serving as a support for a movable contact member 381 pivotally mounted --on a pin 389 extending through said support and arms 39! and 393 of the movable contact member. A clip 465, mounted on the top ofthe cover member 383, is secured to the member 385 and to this clip there is attached the conductor connected with the winding 31! of the solenoid 389. This movable contact member includes a U- shaped member 395, a contact member 391 secured to the member 395 and abuttin a fixed contact member 399 when the switch is closed, a rectangular shaped filler member 40! and the aforementioned arms 39! and 393. A prong 403 of a coil spring 405, sleeved over the pin 389, lies upon the top of the filler member 40! fitted within the U-shaped member 395, said prong serving to bias the movable contact member to its switch closed position. To the under side of the cover member 383 and by the side of the movable contact member there is secured a stamping 491, said stamping being provided at one of its ends with a laterally extending projection 489 to which is secured the fixed contact member 399. A clip 461, mounted on the top of the cover member 383, is secured to the stamping 401 and to this clip there is attached the conductor, Figure 1, connected with one of the contacts, preferably the fixedcontact of the clutch pedal operated breaker switch 319. Through an opening in the cover member 383 and an opening in that portion of the stamping 401 adjacent the projection 409 there extends a bolt 4! Upon the end portion of this bolt extending through the stamping 401 there is threaded a nut M3 and a spring M5 is interposed between the under side of the cover member 383 and the top side of said stamping. A look nut 411 may be threaded on the bolt, said nut contacting the top of a spool shaped bushing 4l9 mounted in the cover member 383 and provided with a bore which is threaded to receive .said bolt. The bolt 4!! therefore provides a means for determining the degree of gap between the fixed and movable contacts 399 and 331 when the switch is opened; for either a rotation of the bolt or a rotation of the nut 4l4 upon the bolt will serve to either compress the spring M5 or permit the same to expand, thereby changing the distance between the contacts 391 and 399 when in their switch open position.

Describing now the valve mechanism of the unit disclosed in Figures 14 and 15, the same comprises an irregular shaped valve support plate 42! extending crosswise of the unit and pivotally mounted upon a pin 423, the ends of which extend through the sides of the body member 38!. One side of the plate 42! is turned up at 425 to provide an ear through which the pin 423 extends and the other side of said plate is turned up to provide the base portion of an arm 421 provided at its end with a laterally extending portion 429, Figure 15. The aforementioned valve member 342 is fixedly secured to the plate 42! and in its valve closed position contacts an annular portion 43! of the body member 38! constituting a valve seat. The valve plate 42! is held in its valve closed position by a valve spring 45!. Both the valve member 342 and switch 34 are opened by a cam 431 pivotally mounted at its ends in the side walls of the body member 38! and shaped to provide flats 439 and 44! lying in diiferent planes. A crank 443 is secured to a pin 445 extending from one end of the cam, said crank being connected to the accelerator !6 by the link !9, Figure 1.

Describing now the operation of the switch and valve unit, when the accelerator is in its released position the cam is moved, by an accelerator return spring 441, to its switch and valve 17 closed position disclosed in Figures 14 and ,15. As disclosed in Figure 15 the portiondzfi of the arm 421 is then spaced a short distance from the flat 4 of the cam. The plate 42 [is at this time held in its valve closed position by the spring 551 and the movable contact member is held in its switch closed position by the spring 495. The switch 34 being closed, the clutch control mechanism then functions to disengage the friction clutch providin of course the engine is idling to create a source of vacuum, the governor operated switch 64 is closed and the clutch pedal 201 is released to close the switch 319. Toreengage the friction clutch below governor speed the driverthen depresses'the accelerator to open the switch 34 and open the valve 342.

Describing this operation of the switch and valve unit, when the accelerator is depressed the crank 443, which is directly connected to the accelerator by the link 19, is rotated clockwise, Figure 14, thereby rotating the cam 431." Now, inasmuch as one edge of the fiat 439 is in contact with the bottom of the member Mil it follows that the clockwise rotation of the cam serves to rotate the contact member 331 in a counter-clockwise direction, thereby opening the switch 34. The opening of the switch 34 results in a'deenergization of the solenoid 359, thereby permitting a spring 453 to move the armature 313 downwardly to the position disclosed in Figures 11 and 12. The valve member 315 which is connected to the armature 313, is thus moved to its valve closed position disclosed in Figures 11 and 12 and this operation of the valve initiates a clutch engaging operation of the motor unit 328 which operation is described hereinafter.

:By continuing the depression of the accelerator the cam 431 is rotated sufficiently to take up the lost motion between the fiat MI and the member 429, Figure 15, and further depression of the accelerator results in a rotation of the cam, and a rotation of the arm 521 and plate 421-; to open the second stage bleed valve member 342. The opening of this valve member results in a venting to the atmosphere of a compartment 455 of the clutch control motor unit. The air travels to said compartment via openings 451 in a'pl'ate459 constituting the base of thezval'v'e and switch unit, compartments 45! and 453 insaid unit which compartments may be filled with'steel wool or other suitable air cleaning material, ports 469 and 311 in the body member 381, a compartment 413 of the unit which houses the above described switch and valve mechanism, a duct 415, a duct 411 and a conduit 419 connected with the motor unit.

There is thus provided in the switch and valve unit disclosed in Figures 1,14 and 15 an accelerartor operated means for in part controlling the operation of the clutch operating motor unit32'8; for, assuming that the switches 319 and 54 are closed and the engine idling, a release of the accelerator serves to effect a closing of theswitch 34, thereby initiating aclutoh disengaging operation of the motor unit. When the accelerator is depressed to open the throttle the first increment of movement of the accelerator results in an opening of the switch as to initiate a clutch engaging operation of the Inotor unit. As will be described in greater detail hereinafter, the

first stage of this clutch engaging operation is automaticallycompletedwhen the clutch plates contact with each other at a predetermined load and the second stage of this clutch engaging op oration and opening of the throttle are; -witli'a cereal ia b o th redeem lifi i iie when the accelerator has been depressed far enough 'to initiate-the movement of the link IB, Figure 1, that is, after the lost motion between the end of thelink and one end of the s'lotin the connection 33 has been taken up'.

Describing now the complete operation of the clutch control mechanism disclosed in Figures '1 14,15 and 9 to 12 inclusive and incidentally completing the description of said mechanism, when the'accelerator i5 is completely released toclose the switch 34, the clutch pedal 251 is in its released position to close the switch 319 and the vehicle is either at a standstill or is traveling at or below the critical governor speed to thereby effect a closing" of the switch 64, then the valve operating solenoid 353 is energized. This'operation results in the armature 313 being drawn upwardly, against the tension of the spring '453 "to seat the valve member 315 at 48!, Figures 1 1 and 12. The clutch control motor unit 328 is then energized; for a"compartment 4 83 of said unit is permanently vented to the atmosphere Via a port 485 in the casing member 33! and the compartment 555 of said unit is at this time connected with the intake manifold of the engine via ducts 481' and 483, Figure 12, in the casing member 35! a valve compartment 49l outlined by the member 311 and the upper surface' of the body member 341, ducts 493 and 495, Figure 11, in the casing member 341, a nipple 491 fitted within the duct 595 and a flexible conduit 495 connected with the intake manifold of the engine. The diaphragm 330 of the motor unit is thus subjected to a differential of pressures resulting in its movement to the dotted line position disclosed in Figure 9 in which position the friction clutch 38 is disengaged, that is'the driven clutch plate 52 is moved away from the driving clutch plate 35 against the tension of the clutch spring 344, Figure 1.

Describing now the clutch engaging operation of the motor'unit 328, when the electricalcircuit including the solenoid'winding 31! is bro,- ken by the opening of any one of the switches 319, 64 or 34,'then the solenoid 359 is deenergized. Thespring 453 acting on the solenoid armature 313 then expands, thereby moving said armature and the valvemember 315-connected thereto downwardly to seat said valve member at 531, Figure 12. This closing operation of the valve member 315 results in a venting of the compartment 355 of the motor unit to the-atmosphere via a hollow nipple 553, Figure 10, mounted inthe valve casing member 3453, acompartment 505 outlined'by the diaphragm 353 and said casing member 349, ducts 5G1 and 509 in the body member 35!, a' compartment 5! I outlined in part by the members 311 and 343, the aforementioned compartment 49! and the aforementioned ducts 489 and 581, the latter leading to the motor compartment 455.

As will be described hereinafter this air trans mitting circuit is made possible by virtue of the fact'that the valve operating diaphragm 3 53 is moved to the left, to move the valve member 351 away from a seat 513, when the motor unit is energized; for when said unit is energized a compartment 5|5 of said unit is partially evacuated by virtue of a conduit 511 which is connected with the compartment 555 of the unit. It'follows therefore that when the compartment 455- is partially evacuated the compartment 5 i5 is to the same degree evacuated and this results in the aforementionedmovement of the diaphragm 353, and the valve 351 connected thereto, tothe left to unseat said'valvel' The compartment 505 is 19 at all times vented to the atmosphere by the hollow nipple 503; accordingly, when the compart ment 515,is partially evacuated the diaphragm 353 is subjected to a differential of pressures resulting in the aforementioned movement of said diaphragm.

The most important feature of the clutch control mechanism of my invention lies in the means for controlling the clutch engaging operation of said mechanism and completing the description of this operation, as stated above, the valve 338 is at this time, that is immediately after the solenoid 359 is deenergized, closed by the seating of valve member 315 on the seat 501, and the valve member 351 is positioned away from the seat 513.

Air then rushes into the motor compartment 455 from the nipple 503 via the above described air transmitting circuit and this action results in the initiation of a movement of the diaphragm 333 to the right, Figure 9, toward its clutch engaged position shown in full lines in said figure, the clutch spring 344 then functioning as a source of power. This operation immediately results in the maintenance of a partial vacuum in the motor compartments 455 and 515, and the maintenance of the diaphragm 353 and the first stage valve member 351 connected thereto in their valve open positions; and the valve member 351 remains in this open position as long as the clutch spring is with full force pulling the diaphragm 339 to the right, Figure 9,'to thereby maintain the partial evacuation of the compartments 455 and 515.

Now when the clutch plates contact at a certain load the pulling force of the clutch spring 344 is reduced and this operation results in a seating of the valve member 351.

Explaining this operation of the mechanism, it is to be remembered that the compartments 455 and 515 are at the time vented to the atmosphere; accordingly, when the vacuum creating movement of the piston 330 is checked by the contacting of the clutch plates, the air continues to rush into said compartments with the result that the spring 359 then functions to seat the valve member 351 and cut off the flow of air into said compartments. At this juncture it is to be observed that the time of closing of the valve 351 and the degree of loading of the clutch plates when the movement of the piston 330 is checked, is determined by the loading of the spring 359; accordingly, the initial loading of the clutch plates and the resultant initial acceleration of the vehicle is determined by the adjustment of the screw 355.

Now all of the above described clutch engaging operations of the parts of the motor unit to effect the first stage of clutch engaging movement of the power element are, with a normal operation of the accelerator, completed before the accelerator is depressed sufficiently to open the throttle and the bleed valve 342; for as previously described the first increment of movement of the accelerator efiects an opening of the switch 34 and this operation initiates the aforementioned first stage operation of the motor unit. Continued depression of the accelerator opens the throttle thereby increasing the torque of the engine and the resultant driving force of the clutch plate 36, and this operation of the accelerator also opens the bleed valve 342 thereby providing the heretofore described supplementary source of air for the compartment 455 of the motor unit. Now the degree of opening of the bleed valve 342 determines the rate of flow of air into the compartment 455 with the resultant progressive increase of the clutch plate loading. There is thus provided in the accelerator operated bleed valve, means cooperating with the throttle for determining the rate of increase of the acceleration of the vehicle, said rate of increase being determined by the mode of operation of the accelerator as the same is depressed. The conduit 51? may be provided with a small bleed opening 519, thereby providing a source of air for the motor compartment 455 which supplements the air to said compartment admitted via the second stage bleed valve 342. If perchance the driver merely depresses the accelerator only a slight distance to open the bleed valve 342, then the air admitted to the compartment 455 via the opening 513 will result in an increase in loading of the clutch plates and thereby prevent a slipping of the clutch.

It is to be noted here that by constructing the mechanism of Figure 1 so that with a normal operation of the accelerator the opening of the throttle and bleed valve is timed to occur at the time when or immediately after the clutch plates first contact with each other, there is.

provided a mechanism which cooperates well with the fluid clutch to effect a smooth start of the vehicle from rest or a speeding up of the, vehicle when the friction clutch of the mechanism of Figure 1 is reengaged by depressing the accelerator; for the fluid clutch, by virtue of its being a yieldable force transmitting medium, will prevent the engine from being stalled both before and after the second stage bleed valve is opened. If, perchance the first stage bleed valve fails to close at the proper time or fails to close at all, then the fluid clutch will, by virtue of a slipping action, prevent a stalling of the engine; and if the driver after a slight opening of the bleed valve 342 fails to continue the depression of the accelerator to increase the engine torque, then the fluid clutch will again prevent the engine from stalling. If the clutch control motor unit is provided with the fixed bleed opening 519 and the driver fails to open the bleed valve 342 then the fluid clutch will prevent the engine from stalling as the clutch plate loading is increased.

There is thus provided, in the clutch control mechanism of that embodiment of my invention disclosed in Figure 1, means cooperating with both the fluid clutch and the transmission operating and ignition controlling motor unit 46 to insure the desired acceleration of the vehicle after a kickdown operation of the transmission.

Describing now the complete operation of the embodiment of my invention disclosed in Figure and incidentally completing the description of the several parts of this mechanism, when the vehicle is at a standstill or coasting to a stop and is below a relatively low vehicle speed, say 10 M. P. H., the parts of the mechanism are in the position disclosed in said figure. In this posi-- tion of the parts the governor operating switch '64 is closed and the accelerator 16 is of course completed released. The friction clutch is accordingly disengaged by the clutch operating motor unit 328 which, as previously described, is energized when the valve 338 is opened.

Now when the grounded switch 64 is closed the electromagnet 3118 of the relay mechanism 334 is energized and an electrical circuit is completed via said switch 54, a conductor 380, the

21 electromagnet 30B, conductors 382, 384, 386, 388. and 390, a fuse 392, a conductor 394, the ignition switch 396 of the ignition system, conductor 338 and the grounded battery 400.

The energization of the electromagnet 308 results in an opening of the switch 3I0 with the resultant opening of the electrical circuit interconnecting the grounded battery 400 and the grounded holding coil 98, said circuit including the conductor 338, the ignition switch 396, the conductor 394, the fuse 392, conductors 330, 388, 386 and 384, conductors 402 and 404, switch 3|0, conductors 406, 438, M and I54, valve operating solenoid H6, conductor H2 and the holding coil 98; and when this circuit is open the solenoid I I6 and the holding coil 98' aredeenergized, the transmission is established in its kickdown setting and the ignition interrupter switch I24 is opened, all as previously described.

As stated above, the accelerator is at this time released; accordingly the switch 3| is open, and when the switch 3| is open the electromagnet 3 I2 of the relay 306 is deenergized resulting in the expansion of a spring M2 to open the breaker switch 3|4 of said relay. This switch 3-|4 constitutes a part of the electrical means interconecting the grounded ignition interrupter I24 of the motor unit and the primary winding of the ignition coil 52 of the engine controlling ignition system. This electrical means also includes the conductor I36, conductors M8 and 420 and conductors 422 and 424, the latter being connected with the primary winding of the ignition coil. It follows therefore that when the vehicle is coasting to a stop with the accelerator released to close the switch 34 and open the switch 3|, the clutch is disengaged to reverse the engine torque and thereby facilitate the kickdown operation of the motor unit 46, the latter operation being automatically effected when the speed of the vehicle reaches the critical speed of the governor, say- 10 M. P. H. It is to be noted that in this operation of the mechanism disclosed in Figure 1 there is no disabling operation of the ignition system, for the relay switch 3|4 is at the time open; accordingly, the primary winding of the ignition coil may not be rounded.

It will be assumed now that the vehicle is at a standstill with the engine idling, the clutch being then disengaged and the transmission being then established in its kickdown setting, and that the driver then wishes to start the vehicle in motion. If the vehicle is perchance mired in the mud the driver will then manually operate the transmission by moving the selector lever positioned beneath the steering wheel to its low gear position. The transmission having been established in this low gear setting by an operation of the shift lever and the crank 48 having been actuated by the motor unit 46 to establish; the transmission in its kickdown setting, it follows that all operations are completed preparatory to getting the vehicle under way. The driver then depresses the accelerator, thereby effecting a controlled engagement of the friction clutch by the operation of the motor 328 and the, vehicle gets under way slowly and smoothly. It is to be particularly noted that the fiuid coupling of the car cooperates with the two stage clutch engaging operation of the motor unit 328 in effecting a smooth start, that is, relatively low acceleration of the vehicle. It is also to be noted, as set forth above, that the fluid coupling may be,

omitted from the power plant in which case the friction clutch control mechanism will of itself suffice to effect a relatively smooth start of the vehicle.

After the vehicle is under way above governor speed the driver will probably desire a higher gear ratio setting of the transmission; accord ingly, he will move the shift lever to establish this setting. The accelerator will be released to reverse the engine torque prior to so operating the transmission and this operation, in cooperation with the fluid coupling, facilitates the necessary demeshing operation of the transmission. Explaining this reversal of the engine torque the release of the accelerator effects an idling operation of the internal combustion engine, that is, said engine is at the time not serving as a primmover to drive the aforementioned movable drive control-element of the transmission; and as previously described the release of the accelerator to idle the engine and open the switch 3| also serves to energize the motor unit 46 to establish the transmission in its upshift gear ratio setting. Describing this operation of the mechanism of Figure 1 when the vehicle is traveling at the higher of the two governor speeds, say 13 M. P. H., the switch '64 is opened, thereby deenergizing the relay electromagnet 308. A spring 426, interposed between one end of the electromagnet 388 and the movable contact 428 of the switch 3 I0, then expands, closing said switch and thereby completing the electrical circuit through the solenoid II6 and holding coil 38 of the motor unit. In the manner previously described the motor unit is then energized by vacuum to effect the upshift setting of the transmission and the closing of the ignition interrupter switch I24.

The upshift operation of the transmission having been effected the drive will then again depress the accelerator to increase or maintain the speed of the vehicle. It will be assumed now that the internal combustion engine is operating at a speed below that necessary to open the wind switch 3.|'| and that the driver desires to effect a knickdown operation of the transmission to thereby make it possible to quickly pass another vehicle on the road. To effect this operation of the transmission all that the driver need do is to depress the accelerator all the way down, that is, far enough to close the switch 3 I. This operation effects a closing of the electrical circuits to energize both the electromagnets 308 and 3I2 of the relay mechanism 302 for as disclosed in Figure 1 the eletromagnet 3|2 is electrically connected to the battery 400 by a conductor 428, the conductor 402 and all but the conductor 382 of the previously described electrical means connecting the battery and the electromagnet 338. The electromagnet 3|2 is electrically connected to the then closed grounded wind switch 35"! by means of a conductor 430, the poles 432 and 433 and the movable contact plate 434 of the then closed three-pole switch 3| and a conductor 436. As to the closed electrical circuit effecting the energization of the electromagnet 308 this circuit includes the grounded wind switch 3II, the conductor 436, the pole 433, the movable contact 434 and a pole 438 of the switch 3|, a conductor 440, a part of the conductor 380, the electromagnet 338 and the previously described electrical means interconnecting said magnet with the grounded battery, all as disclosed in Figure 1.

Now when the electromagnets 308 and 3I2 are energized the movable contact 428 of the switch 3m and the movable contact 442 of the switch 3 are moved to close the switch 3M and open the switch 3W. This operation results in a deenergization of the solenoid H6 and holding coil 98 of the motor unit 48 thereby effecting an energization of said unit by an operation of the spring 288, all as previously described. This op eration also makes possible, by virtue of the closing of the switch 314 a momentary disabling of the ignition system as the motor unit is operat- 1ng.

It is apparent therefore that when the accelerator is fully depressed the motor unit 46 is energized by the expansion of the spring 208 to establish the transmission in its kickdown setting, this operation being facilitated by momentarily disabling the ignition system to reverse the torque of the internal combustion engine. If the engine is operating at a relatively high speed, which operation usually results in a relatively high vehicle speed, say 50 M. P. PL, then this kickdown operation of the motor unit is not effected when the accelerator is depressed far enough to close the switch 3!; for the wind switch 6? is then opened thereby making it impossible to complete the electrical circuits to energize the electromagnets of the relay mechanism 392,

Continuing the description of a cycle of operations of the mechanism disclosed in Figure 1 it will be assumed that the kickdown operation of the transmission served its purpose of enabling the driver to quickly pass the other car on the :road. The driver will then probably again release the accelerator sufficiently to again energize the motor unit Q8 by vacuum to effect an upshift operation of the transmission. To bring the vehicle to a stop the accelerator is released and when the speed of the vehicle is decreased below governor speed the motor unit will, by virtue of the closing of the governor operated switch 64, again be energized by the spring 263 to effect another kickdown operation of the transmission. The disengagement of the friction clutch by the motor 328 will of course facilitate this operation.

Concluding the discussion of the mechanism disclosed in Figure 1, it is to be noted that by virtue of the incorporation of the ignition switch 356 in the wiring between the battery and the relay switch 3H3, said ignition switch serves the useful function, when it is opened, of insuring a deenergization of the solenoid i6 and holding coil 88 despite a failure of operation of the relay mechanism; for should this relay mechanism fail in its operation of opening the switch 3 i 0, that is, opening the electrical circuit from the solenoid and holding coil to the battery when the car is being brought to a stop below governor speed, then the compartment I98 of the motor unit 46 would, by virtue of the pumping action of the engine pistons, continue to be partially evacuated to hold the power element of the motor unit in its upshift position and the then energized holding coil would continue to function to hold the power element in this position. This operation would result in the transmission being established in an undesired gear ratio setting when the car brought to a stop. This setting of the transmission, that is, the higher of the two gear ratio settings effected by the operation of the motor unit 46, is particularly undesirable when the car is brought to a stop on an incline; for when the vehicle is then again started in motion the engine, because of the relatively high gear ratio setting of the transmission, might be stalled.

/ Now by the incorporation of the. ignition switch in the electrical circuit interconnecting the battery, the solenoid H 5 and the holding coil 98 there is provided a mechanism which prevents this undesired result; for when the driver, either intentionally or unintentionally opens the ignition switch before the car rolls to a stop the solenoid H6 and holding coil 98 are automatically deenergized and this operation results in connecting the motor compartment I98 to the atmosphere thereby effecting a downshift operation of the motor unit. When the driver brings the car to a stop in a conventional manner he usually opens the ignition switch to stop the engine after the car is stopped in the desired position; however, the principal virtue of the above described mechanism lies in the fact that should the driver carelessly cut oil the ignition switch as the car is being brought to a stop or on an incline the transmission will, because of this very act, be established in its downshift setting.

There is thus provided in the mechanism disclosed in the several figures of the drawing a power plant for an automotive vehicle requiring of the driver but a minimum of mental and physical effort in the control thereof. The controls for said power plant, all of which constitute a part of my invention, consist of the accelerator, an ignition switch, a governor operated switch, a clutch pedal, and a transmission operating shift lever. These elements control the operation of the internal combustion engine, the ignition system, a fluid clutch, a friction clutch, a changespeed transmission and power means constituting part of the means for operating said transmission. The accelerator operates a switch for controlling the operation of the transmission and also operates thethrottle of the engine thereby controlling the engine torque and the operation of the fluid clutch. The ignition switch constitutes not only a part of the ignition system which in part controls the operation of the internal combustion engine, but also serves to in part control the operation of the transmission operating power means. The clutch pedal cooperates with the fluid clutch to control the connection between the engine and the transmission; the shift lever cooperates with the transmission operating power means to effect an operation of the transmission and the governor operated switch cooperates with the accelerator operated switch to control the operation of the transmission operating power means.

It may be added that with the embodiment of my invention disclosed in Figure 1 the accelerator, clutch pedal and governor operated switch of the aforementioned controls cooperate to control the operation of the friction clutch; and the accelerator and the governor operated switch serve as part of the means for controlling both a clutch operatin power means and the aforementioned transmission operating power means.

In short, all of the aforementioned five controls cooperate to make of the power plant an efficient and effective means for propelling the vehicle.

Although this invention has been described in connection with certain specific embodiments, the principles involved are susceptible of numerous other applications that will readily occur to persons skilled in the art. The invention is, therefore, to be limited only as indicated by the scope of the appended claims.

I claim:

1. In an automotive vehicle provided with a change-speed transmission, a friction clutch, an accelerator, an accelerator operated switch 

